Smack round lug and hurry away (5,3)
I believe the answer is:
clear out
'hurry away' is the definition.
(as in clearing out an area by hurrying people away)
'smack round lug' is the wordplay.
'smack' becomes 'clout' (I've seen this before).
'round' is an insertion indicator.
'lug' becomes 'ear' (I've seen this before).
'clout' going around 'ear' is 'CLEAR OUT'.
'and' acts as a link.
(Other definitions for clear out that I've seen before include "Leave quickly" , "Empty" , "Get rid of" .)